This comprehensive guide explains All-Time High (ATH) in cryptocurrency, a critical metric representing the highest price an asset has ever reached. Designed for both beginners and experienced traders, the article covers ATH's definition, significance in market analysis, and psychological impact on trading decisions. It examines what happens when cryptocurrencies reach ATH, exploring market trend shifts, profit-taking behavior, and price correction cycles. The guide traces ATH's origin from traditional finance and highlights Bitcoin's notable ATH milestones, from $1 in 2011 to $68,350, demonstrating the asset's growth trajectory. It contrasts ATH with All-Time Low (ATL), providing a complete price range perspective. By understanding ATH levels, traders can identify optimal entry and exit points, manage risk effectively, and navigate volatile crypto markets with greater strategic clarity and informed decision-making on platforms like Gate.